Benzoxepin derivatives

ABSTRACT

The compounds are benzoxepinones which are central nervous system depressants. A compound disclosed is 8,9,10,11-tetrahydro3-hydroxydibenz(b,d)oxepin-6(7H)one.

United States Patent 1191 Freedman Aug. 12, 1975 [54] BENZOXEPIN DERIVATIVES [75] Inventor: Jules Freedman, Thiensville, Wis. [56] References Cited [73] Assignee: Colgate-Palmolive Company, New UNITED STATES PATENTS York, NY. 3,624,083 11 1971 Dobson et al 260/3432 [22} Filed: 1974 Primary Examiner loli'n M. Ford [21] Appl. No.: 462,604 Attorney, Agent, or Firrrw-T. F. Kryshak; M. L.

Related US. Application Data Youngs [63] Continuation-impart of Ser. No. 339,057, March 8,

1973, abandoned. [57] ABSTRACT The compounds are benzoxepinones which are central [52] US. Cl ..260/343.2 R; 260/2955 B; nervous system depressants. A compound disclosed is 260/3322 H; 424/279 8,9,lO,l ltetrahydro*3-hydroxydibenz[b,d]oxepin- 51 Int. c1. C071) 313/10 H)one. {58] Field of Search 260/343.2 R, 295.5 B, 332.2 H

10 Claims, No Drawings HF"? I BENZOXEPIN DERIVATIVES RELATED CASE This application is a continuation-in-part of my earlier application, Ser. No. 339,057, filed Mar. 8, 1973 now abandoned.

BACKGROUND OF THE INVENTION The compound 2,3-dihydro-7,9-dimethyl-1- benzoxepin-2-one-5-carboxylic acid was disclosed by R. V. Smith and M. D. Bealor in J.' Org. Chem., 27, 3,092 (1962).

DETAILED DESCRIPTION The compounds of the present invention have the following formula:

in which R is hydrogen or a straight chain or branched alkyl of 1 to 9 carbon atoms such as methyl, ethyl, isopropyl or butyl, R is hydrogen, a lower alkyl of l to 4 carbon atoms or phenyl, and R and R are the same or different and may be hydrogen, a lower alkyl of l to 4 carbon atoms, an aryl such as phenyl or a nuclear substltilted phenyl such as dimethyl, a halophenyl such as diehlerepheayl or trifluoromethylphenyl, a heterocyelie sueh as fiicitinoyl or thenoyl, or R and R may be jQlflQ to ether by a straight or branched alkylidene chain t6 forth a cycloalkyl such as cyclohexyl or methyheyeleaexyt The @QMEQBHQS of the present invention may be con veniently prepared by the reaction of a phenol such as Efiflflbl with a ilr-k'eto acid or ester such as 4-methyl- Z=Xlhilifiiitic acid in the presence of a condhfllflg agent such as polyphosphoric acid, boron tri-' fluoride Q? phosphorous bx'ychlo'ride. The process may be illustrated as fallawsz condens ing agent The above-illustrated reaction is a modification of the well-known Pechmann reaction which is described in the literature (Organic Reactions, Vol. 7, page 1, 1953).

Representative of the phenols which may be employed in the reactions are the following:

resorcinol,

orcinol,

S-n-hexylresorcinol,

olivetol, and

5-( l ,2-dimethylheptylresorcinol).

Representative of the 'y-keto acids and' esters which may be employed are the following:

4-methyl-2-oxocylcohexaneacetic acid, 3-benzoylpropionic acid,

3-( 3 ,4-dichlorobenzoyl )-propionic acid, 2-oxocyclohexaneacetic acid, 3-(3-nicitinoyl)propionic acid,

3-( Z-thenoyl )propionic acid, 3-(4-fluorobenzoyl)propionic acid, 3-(4-methoxybenzoyl)propionic acid, 3-benzoylbutyric acid, 2-methyl-3-benzoylbutyric acid, Z-phenyl-3-benzoylbutyric acid, ethyl-Z-oxocyclohexaneacetate, and ethyl-2-oxo-4-methylcyclohexaneacetate.

Representative of the benzoxepinones which may be prepared by the described process are the following:

8,9, 10,1 1-tetrahydro-3-hydroxydibenz[ b,d]oxepin- 6(7l-I )one,

8,9,10,1 1-tetrahydro-3-hydroxy-lO-methyldibenz- [b,d]oxepin-6(7H)one,

8,9,10,1 1-tetrahydro-3, 1 O-dimethyll-hydroxydibenz[b,d]oxepin-6(7H)one,

8 ,9, l 0,1 1 -tetrahydro- 1 -hydroxyl 0-methyl-3-n-pentyldibenz[b,d]oxepin-6(7H) one,

3-( 1,2-dimethylheptyl)-8,9,10,1 l-tetrahydro- 1 hydroxy-10-methyldibenz[b,d]oxepin-6(7H)one,

3-n-hexyl-8 ,9, l 0,1 ltetrahydro- 1 -hydroxyl O-methyldibenz[b,d]oxepin-6(7l-I)one,

3-n-pentyl-8,9,10,1 l-tetrahydro- 1 -hydroxy- 10-methyl dibenz[b,d]oxepin-6( 7H)one,

5-phenyl-2,3-dihydro-8-hydroxyl -benzoxepin-2-one,

5-( 3 ,4-dichlorophenyl )-2,3-dihydro-8-hydroxyl benzoxepin-Z-one,

5-( 3-nicitinoyl )-2,3-dihydro-8-hydroxy- 1 -benzoxepin- 2-one,

5-( 3-thenoyl )-2,3-dihydro-8-hydroxy- 1 -benzoxepin- 2-one,

5-(4-fluorophenyl )-2,3-dihydro-8-hydroxy- 1 benzoxepin-Z-one,

5-(4-methoxyphenyl)-2,3-dihydro-8-hydroxy-1- benzoxepin-Z-one,

S-phenyl-Z,3-dihydro-8-hydroxy-6-methyllbenzoxepin-2-one,

5-phenyl-8-methyl-6-hydroxy-2,3-dihydrolbenzoxepin-Z-one,

5-(3-nicitinoy1)-8-n-hexyl-6-hydroxy-2,B-dihydro-1- benzoxepin-Z-one.

5( 3-thenoy1)-8-n-hexyl-6-hydroxy-2,3-dihydrol benzoxepin-Z-one,

3 -(4-fluorophenyl )-8-n-hexyl-6-hydroxy-2,3-dihydro- 1 -benzoxepin-2-one, 5-(4-methoxyphenyl)-8-nhexyl-6-hydroxy-2,3-

dihydro- 1 -benzoxepin-2-one, 5-( phenyl-3 -methyl 8-n-hexy1- 6-hydroxy-2,3-dihydrol-benzoxepin-Z-one, and 3 ,5-diphenyl-8-n-hexyl-6-hydroxy-2,3-dihydro- 1 benzoxepin-2-one.

The benzoxepinones thus obtained are useful as intermediates in the preparation of the corresponding benzoxepines which are central nervous system depressants.

The novel compounds of the invention also have been found to elicit a central nervous system depres- I sant effect in animals. For example, the compound 9,9- ,10,1 l-tetrahydro-3-hydroxydibenz[ b,d]oxepin- 6(7H)one has produced in mice in behavioral screening tests a behavioral profile typical of that produced by mild central nervous system depressants of the tranquilizer type. In mice receiving 100 mg/kg of the compound intraperitoneally as a 5 percent aqueous suspension, a central nervous system depressant effect was demonstrated. As an added result of the behavioral testing, the compound was found to have an LD of more than 1,000 mg/kg. The behavioral studies were conducted in accordance with the procedures set forth by Irwin in Animal and Clinical Pharmacologic Techniques in Drug Evaluation, J. H. Nodine and P. E. Siegler, Ed., Year Book Publishers, Inc. 1964), pp. 36-54.

When used as pharmaceutical agents it is preferred to combine the compounds with conventional pharmaceutical additives, such as diluents, flavoring agents, disintegrating agents, and to form them into conventional unit dosage forms, such as tablets or capsules for oral use, or sterile liquids for parenteral administration.

The unit dosage forms such as tablets or capsules will generally contain a concentration of 0.1 to 10 percent by weight of one or more of the active ingredients. While the exact daily dose of the active ingredient will depend upon many factors, including the severity of the patients condition and the other medication being administered, it will generally range from 10 to 250 mg. per day.

The following examples are presented to illustrate the practice of this invention:

EXAMPLE 1 8 ,9,10,1 1-Tetrahydro-3-hydroxydibenz[ b,d ]oxepin- 6( 7H )one A mixture of 26.7 g. (0.145 mole) of ethyl 2-oxocyclohexaneacetate, 16.5 g. (0.15 mole) of resorcinol, and 75 g. of polyphosphoric acid is stirred for 2 hours. When the exothermic reaction ceases, the mixture is poured into 150 ml. of water and stirred until the polyphosphoric acid decomposes. The product is extracted into ether and the extracts dried over magnesium sulfate. The ether is removed and the residue dissolved in 100 ml. of toluene. Cooling gives the 8,9,l0,1 1- tetrahydro-3-hydroxydibenz[b,d]oxepin-6(7H)one, m.p. 170-175. Two recrystallizations from ethyl acetate give an analytical sample, m.p. 183-184.

Anal. Calcd. for C H O C, 73.02; H, 6.13. Found: C, 72.72; H, 5.94.

EXAMPLE 2 8,9, 10,1 l-Tetrahydro-3-hydroxyl0-methyldibenz[b,- 'd]oxepin-6(7H)one A mixture of 34.2 g. (0.172 mole) of ethyl 2-oxo-4- methylcyclohexaneacetate, 18.8 g. (0.172 mole) of resorcinol, and 107 g. of polyphosphoric acid is heated on a steambath for 1 hour, cooled and poured into 150 m1. of ice water. When the polyphosphoric acid decomposes, the product is extracted into chloroform and the extracts dried over magnesium sulfate. The product (4.1 g., m.p. l40l45) is isolated by chromatography on silica gel and elution with chloroform. Recrystallization from methylcyclohexane gives 8,9,l0,1 1- tetrahydro-3-hydroxyl0-methyldibenz[ b,d oxepin- 6(7H)one, m.p. 144146.

Anal. Calcd. for C H O C, 73.75; H, 6.60. Found C, 73.83; H, 6.61.

EXAMPLE 3 8,9, l 0,1 1 -Tetrahydro-3 IO-dimethyl- 1 -hydroxydibenz[b,d]oxepin-6( 7H)one A mixture of 17.0 g. (0.1 mole) of 4-methyl-2-oxocyclohexaneacetic acid, 14.2 g. (0.1 mole) of orcinol monohydrate, 12 ml. (0.132 mole) of phosphorous oxychloride, and 200 ml. of benzene is heated to reflux for 2 hours, cooled in ice, and treated with 100 ml. of

'water. The benzene layer is separated, washed with sodium bicarbonate solution and dried with magnesium sulfate. The lactone 8,9,10,1 1-tetrahydro-3,10- dimethyl-l-hydroxydibenz[b,d]oxepin-6(7H)one is recrystallized twice from 15 volumes of nitromethane,

m.p. l94l96.

Anal. Calcd. for C H O C, 74.39; H, 7.02. Found:

EXAMPLE 4 8,9,10,1 1 -Tetrahydrol-hydroxy- 10-methyl-3-npentyldibenz b,d ]oxepin-6( 7H )one A mixture of 7.1 g. (0.04 mole) of 4-methyl-2-oxocyclohexaneacetic acid, 6.8 g. (0.04 mole) of olivetol, 4.8 ml. (0.052 mole) of phosphorous oxychloride, and ml. of benzene is refluxed for 2 hours, cooled, and 40 ml. of water added. The benzene layer is separated and .washed with sodium bicarbonate solution. The solvent is removed and the lactone isolated by chromatography on silica gel and elution with a mixture of equal parts of toluene and chloroform. The lactone (3.8 g., m.p. 8182) is recrystallized from nitromethane to give an analytical sample of 8,9,10,1 l-tetrahydro-l-hydroxy- 10-methyl-3-n-penty1dibenz[ b,d ]oxepin-6( 7H )one, m.p. 899l.

Anal. Calcd. for G l-1 0 C, 76.40; H, 8.34. Found: C, 76.74; H, 8.34

EXAMPLE 5 2,3-Dihydro-8-hydroxy-5-phenyl-1 -benzoxepin-2-one .5 hydroxy-S -phenyl- 1 benzixepinQ-one, 14s-150. Anal. cam. for c.-.,H, 'o,:c, 76.16 H, 4.80. Found: C,75.89;H,4.80. v

. cooled and treated with 100 ml. of water. The benzene layer is separated and washed with sodium bicarbonate solution. Removal of the benzene and recrystallization of the residue from nitromethane gives 5-(3,4- dichlorophenyl )-2 ,3-dihydro-8-hyclroxy- 1 -benzoxepin- 2-one, m.p. 198201.

Anal. Calcd. for 0, 11, 01,0 1 C, 59.83; H, 3.14; Cl, 22.08. Found: C, 59.90; H, 3.27; Cl, 22.23.

EXAMPLE 7 8,9,10,1 1 -Tetrahydrol-hydroxy- 1 -methyl-3-( 3- methyl-Z-octyl )-dibenz[b,d]oxepin-6( 7H)one A mixture of 16.35 g. (0.0695 M) of threo--(3- methyl-2-octyl)-resorcinol, 11.8 g. (0.0695 M) of 4- methyl-2-oxocyclohexaneacetic acid, 22 ml. of boron trifluoride etherate and 140 ml. of methylene chloride is refluxed for 2.5 hours, shaken with cold water and filtered through magnesium sulfate. Removal of the solvent gives an oil which is chromatographed on 1 kg. of silica and the product eluted with chloroform. The product 14.3 g.) so obtained is distilled in a Kugelrohr 'ap'p'ai'atus at 170/0.5 mm. to give 8,9,10,11- teif'ttliydro- 1 hydroxyl -methyl-3-( 3-methyl-2-octyl)- dib@hz[b,d]oxepin-6(7H)-one, m.p. 65-67.

Anal. Calcd. for C H O C, 77.80; H, 9.25. Found: 77.65; H, 9.30.

EXAMPLE 8 A mixture 0? 25.4 g. (0.15 M) of 4-methyl-2-oxocyelehexaneaeetie acid, 31.3 g. 0.15 M) of 5- 2- heptyhresereinel, 46 ml. of boron trifluoride etherate, and 300 m1. of methylene chloride is refluxed for 3 hours, eaelea and shaken with 1 liter of cold water. The organic layer is filtered through magnesium sulfate and the selvent remaved. The residue is chromatographed 011 15 kg. efsiliea and eluted with chloroform. The oily product 1% tri tufated with cyclohexane until solids form. Filtration and recrystallization from 60 ml. of nitromet'aane gives 16.14 g. 31.4 percent), m.p. 1 10-113. The cembined residues from mother liquors are distilled in a Ktlgelrohr apparatus at 150155/0.35 mm. to give an oil which solidifies on standing. Trituration with nitromethane gives 7.76 g. (46.5 percent) ofa lactone. A 3.14 g. portion is recrystallized from 10 ml. of nitromethane to give 3-(2-heptyl)-8,9.10,l 1tetrahydro- 1 -hydroxy- 1 0 -methyldibenz[ b,d ]-oxepin- 6(7H)one, m.p. ll3-1 Anal. Calcd. fOr-C H O I C, 77.15; H, 8.83. Found: C, 77.09; H, 8.82.

- EXAMPLE 8,9,10,1 1 -Tetrahydro- 1"-hydroxy-3-n hexyll O-niethyldibenz[b,d]oxepin'-6(7H)one A mixture of 19.4 g. (0.1 14 M) of 4-methyl-2-oxocyclohexaneacetic acid, 22.12 g. (0.1 14 M) of 5- hexylresorcinol, 230ml. of methylene chloride, and 34 ml. of boron trifluoride etherate is allowed to stand at room temperature for 5 days. The solution is shaken with cold water and dried over magnesium sulfate. Removal of the solvent leaves an oil which is chromatographed on 600 g. of alumina. Elution with chloroform gives the crude product. Two recrystallizations from nitromethane give 8,9, 10,1 l-tetrahydrol -hydroxy-3- n-hexyl-10-methyldibenz[b,d]oxepin-6(7H)one, m.p. 88.

Anal. Calcd. for C l-1 0 C, 76.78; H, 8.59. Found: C, 76.78; H, 8.56.

EXAMPLE 10 8 ,9 ,10, 1 l-Tetrahydro- 1 -hydrox y-10-methyl-3 2- methyloctyl )dibenz[ b,d oxepin-6( 7 H )one A mixture of 23.6 g. (0.1 M) of 5-(2- methyloctyl)resorcinol, 17.0 g. (0.1 M) of 4-methyl-2- oxocyclohexaneacetic acid, 30 ml. of boron trifluoride etherate, and 250 ml. of methylene chloride is refluxed for 3 hours, cooled and poured into 250 ml. of cold water. The organic layer is separated and shaken with dilute potassium carbonate then saturated NaCl and dried over magnesium sulfate. Evaporation of the solvent leaves 46.7 g. of oil. Distillation in a Kugelrohr apparatus at l200/0.4 mm. followed by chromatography on 300 g. of silica and elution with toluene gives 8 ,9, 10, 1 l -tetrahydro- 1 -hydroxy- 10-methyl-3-( 2- methyloctyl)-dibenz[b,d]oxepin 6(7H)one as a viscous oil.

Anal. Calcd. for C H O C, 77.58; H, 9.25. Found: C, 77.85; H, 9.18.

1 claim:

1. A compound of the following formula:

in which R is hydrogen or an alkyl of 1 to 9 carbon atoms, and R is hydrogen, a lower alkyl of 1 to 4 carbon atoms or phenyl, R and R are hydrogen, lower alkyl of 1 to 4 carbon atoms, phenyl, halophenyl, dihalophenyl, dimethylphenyl, and alkoxyphenyl, or a heterocyclic group selected from nicitinoyl and thenoyl, or R and R are joined together by an alkylidene chain to form cyclohexyl or methyl-cyclohexyl.

2. A compound of claim 1 in which R is hydrogen.

3. A compound of claim 1 in which R is hydrogen.

4. A compound of claim 1 in which R and R are hydrogen, and R and R are joined together by an ethylene chain.

5. A compound of claim 1 in which R and R are hydrogen, R is hydrogen, and R is phenyl.

7 8 6. The compound of claim 1 which is 2,3-dihydr-8- 9. The compound of claim 1' which is 8.9,l0,l ly y- 'p y 1 P tetrahyd ol -hyd roxyl-methyl- 3-( 3-methyl-2-octyl 7. The compound of claim 1 which is 8,9,lO,l ldibenzlb dlokepinuflmne tetrahyfim-l'hydroxy-1oqnethyl-3 n-pentyldlbenz[b" 101 The compound of claim 1 which is 8,9,10,11- d]oxepm-6(7H)-one.

5 v 8. The 'compound of claim 1 which is 8,9,10,1ld tetrahydro-l-hydroxy-3,lO-dimethyldibenz[b,d]oxel fll p n-fl7H)0n 1 I pin-6(7H)one. .4

UNITED STATES PATENT AND TRADEMARK OFFICE CERTIFICATE OF CORRECTION PATENT NO. 3,899,512

DATED August 12 1975 INVENTOR(S) Jules Freedman It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

Column 3, line 17, "9,9,lO,ll-" should read "8,9,10,ll". Column 5, line ll, "pripionic" should read "propionic".

. Signed and Scaled this twelfth Day Of July 1977 [SEAL] Attest:

RUTH c. MASON c. MARSHALL DANN Allesting ff Commissioner of Patents and Trademarks 

1. A COMPOUND OF THE FOLLOWING FORMULA:
 2. A compound of claim 1 in which R is hydrogen.
 3. A compound of claim 1 in which R1 is hydrogen.
 4. A compound of claim 1 in which R and R1 are hydrogen, and R2 and R3 are joined together by an ethylene chain.
 5. A compound of claim 1 in which R and R1 are hydrogen, R2 is hydrogen, and R3 is phenyl.
 6. The compound of claim 1 which is 2,3-dihydro-8-hydroxy-5-phenyl-1-benzoxepin-2-one.
 7. The compound of claim 1 which is 8,9,10,11-tetrahydro-1-hydroxy-10-methyl-3-n-pentyldibenz(b,d)oxepin-6(7H) -one.
 8. The compound of claim 1 which is 8,9,10,11-tetrahydro-1-hydroxy-3,10-dimethyldibenz(b,d)oxepin-6(7H)one.
 9. The compound of claim 1 which is 8,9,10,11-tetrahydro-1-hydroxy-1-methyl-3-(3-methyl-2-octyl) -dibenz(b,d)oxepin-6(7H)one.
 10. The compound of claim 1 which is 8,9,10,11-tetrahydro-1-hydroxy-10-methyl-3-(2-methyloctyl)dibenz(b,d)oxepin -6(7H)one. 